During a star's main sequence portion of its life it does not change size appreciably. This observation indicates that
A. the Sun produces about the same amount of energy as it radiates into space.
B. the Sun produces less energy than it radiates into space.
C. the Sun produces more energy than it radiates into space.
Answer: A
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Space itself is expanding
Indicate whether the statement is true or false
If an optical system consists only of an object and a single convex mirror,
a. the image will sometimes be inverted. b. the magnification will sometimes have an absolute value greater than 1. c. the image distance will never be negative. d. the image will always be virtual.
Find the force (magnitude and direction) exerted on an electron moving vertically upward at a speed of 
m/s by a horizontal magnetic field of 0.50 T directed north.
a. 
b. 
c. 
d. 
When water vapor condenses out at the cool tops of convection cells, what happens?
A) It rains. B) It snows. C) Clouds form. D) A hurricane forms. E) A tropical depression forms.